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Business and summary of significant accounting policies (Details) (USD $)
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9 Months Ended | 12 Months Ended | |||
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Business and summary of significant accounting policies [Abstract] | |||||
| Foreign currency transaction gains (losses) | |||||
| Property and equipment impairment charge | 5,059,495 | ||||
| Other long-lived asset impairment charges | 74,057 | 304,858 | |||
| Advertising expense | 1,614,090 | 1,175,101 | 1,552,557 | ||
| Gain (loss) on foreign currency translation, net | $ 105,711 | $ (6,074) | $ (12,092) | ||
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- Definition
Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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